Hmm...lots of great suggestions. I like Divine Adept...pretty generic, but still evocative and kinda heroic sounding.
Supplicant is good, too, but sounds much more humble (which is not a not a bad thing for a low-level cleric). I'll just have to figure out which tone I want for the class.
Celebrim makes a good point about the problems with class level-titles. It's possible that someone could take this generalist cleric class through 20th level, and never switch into a specific Prestige Class. Kind of awkward to have a 20th-level acolyte...but an interesting concept. A cleric that never "went pro"...
Thanks, everyone, and keep the good ideas coming!